Final answer:
The geographic center of the contiguous United States is located in Kansas, specifically in Smith County, about 2 miles northwest of Lebanon.
Step-by-step explanation:
The geographic center of the contiguous United States is located in Kansas. Specifically, it is in Smith County, about 2 miles northwest of Lebanon. This point was determined by the U.S. National Geodetic Survey in 1918 using a mathematical algorithm, taking into account the shape and boundaries of the 48 states at that time.